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Thermoelectric properties of unoxidized graphene/Bi2Te2.7Se0.3 composites synthesized by exfoliation/re‐assembly method |
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| Authors: | Jin Il Kim Eun Sil Lee Jong‐Young Kim Soon‐Mok Choi Kyu Hyoung Lee Won‐Seon Seo |
| Institution: | 1. Icheon Branch, Korea Institute of Ceramic Engineering and Technology, 3321 Gyeongchung Daero, Sindun‐myeon, Icheon‐si, Gyeonggi‐do 467‐843, Korea;2. School of Energy, Materials and Chemical Engineering, Korea University of Technology and Education, Cheonan 330‐708, Korea;3. Materials R&D Center, Samsung Advanced Institute of Technology, Yongin 446‐712, Korea;4. Energy and Environmental Division, Korea Institute of Ceramic Engineering and Technology, Seoul 153‐801, Korea |
| Abstract: | Nanocomposites of n‐type thermoelectric Bi2Te2.7Se0.3 (BTS) and unoxidized graphene (UG) were prepared from the exfoliated BTS and UG nanoplatelets. Polycrystalline BTS ingots were exfoliated into nanoscoll‐type crystals by chemical exfoliation, and were re‐assembled with UG nanoplatelets. The composites were chemically reduced by hydrazine hydrate and sintered by a spark‐plasma‐sintering method. The thermoelectric properties of the sintered composites were evaluated and exhibited decreased carrier concentration and increased thermal conductivity due to the embedded graphene. The peak ZT values for the UG/BTS‐US and UG/BTS‐EX composites were ～0.8 at the UG concentration of 0.05 wt%. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Keywords: | thermoelectric properties bismuth telluride graphene exfoliation |